drivers/nfc/pn533/usb.c

   1 /*
   2  * Driver for NXP PN533 NFC Chip - USB transport layer
   3  *
   4  * Copyright (C) 2011 Instituto Nokia de Tecnologia
   5  * Copyright (C) 2012-2013 Tieto Poland
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <linux/device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/usb.h>
  26 #include <linux/nfc.h>
  27 #include <linux/netdevice.h>
  28 #include <net/nfc/nfc.h>
  29 #include "pn533.h"
  30
  31 #define VERSION "0.1"
  32
  33 #define PN533_VENDOR_ID 0x4CC
  34 #define PN533_PRODUCT_ID 0x2533
  35
  36 #define SCM_VENDOR_ID 0x4E6
  37 #define SCL3711_PRODUCT_ID 0x5591
  38
  39 #define SONY_VENDOR_ID         0x054c
  40 #define PASORI_PRODUCT_ID      0x02e1
  41
  42 #define ACS_VENDOR_ID 0x072f
  43 #define ACR122U_PRODUCT_ID 0x2200
  44
  45 static const struct usb_device_id pn533_usb_table[] = {
  46         { USB_DEVICE(PN533_VENDOR_ID, PN533_PRODUCT_ID),
  47           .driver_info = PN533_DEVICE_STD },
  48         { USB_DEVICE(SCM_VENDOR_ID, SCL3711_PRODUCT_ID),
  49           .driver_info = PN533_DEVICE_STD },
  50         { USB_DEVICE(SONY_VENDOR_ID, PASORI_PRODUCT_ID),
  51           .driver_info = PN533_DEVICE_PASORI },
  52         { USB_DEVICE(ACS_VENDOR_ID, ACR122U_PRODUCT_ID),
  53           .driver_info = PN533_DEVICE_ACR122U },
  54         { }
  55 };
  56 MODULE_DEVICE_TABLE(usb, pn533_usb_table);
  57
  58 struct pn533_usb_phy {
  59         struct usb_device *udev;
  60         struct usb_interface *interface;
  61
  62         struct urb *out_urb;
  63         struct urb *in_urb;
  64
  65         struct urb *ack_urb;
  66         u8 *ack_buffer;
  67
  68         struct pn533 *priv;
  69 };
  70
  71 static void pn533_recv_response(struct urb *urb)
  72 {
  73         struct pn533_usb_phy *phy = urb->context;
  74         struct sk_buff *skb = NULL;
  75
  76         if (!urb->status) {
  77                 skb = alloc_skb(urb->actual_length, GFP_ATOMIC);
  78                 if (!skb) {
  79                         nfc_err(&phy->udev->dev, "failed to alloc memory\n");
  80                 } else {
  81                         skb_put_data(skb, urb->transfer_buffer,
  82                                      urb->actual_length);
  83                 }
  84         }
  85
  86         pn533_recv_frame(phy->priv, skb, urb->status);
  87 }
  88
  89 static int pn533_submit_urb_for_response(struct pn533_usb_phy *phy, gfp_t flags)
  90 {
  91         phy->in_urb->complete = pn533_recv_response;
  92
  93         return usb_submit_urb(phy->in_urb, flags);
  94 }
  95
  96 static void pn533_recv_ack(struct urb *urb)
  97 {
  98         struct pn533_usb_phy *phy = urb->context;
  99         struct pn533 *priv = phy->priv;
 100         struct pn533_cmd *cmd = priv->cmd;
 101         struct pn533_std_frame *in_frame;
 102         int rc;
 103
 104         cmd->status = urb->status;
 105
 106         switch (urb->status) {
 107         case 0:
 108                 break; /* success */
 109         case -ECONNRESET:
 110         case -ENOENT:
 111                 dev_dbg(&phy->udev->dev,
 112                         "The urb has been stopped (status %d)\n",
 113                         urb->status);
 114                 goto sched_wq;
 115         case -ESHUTDOWN:
 116         default:
 117                 nfc_err(&phy->udev->dev,
 118                         "Urb failure (status %d)\n", urb->status);
 119                 goto sched_wq;
 120         }
 121
 122         in_frame = phy->in_urb->transfer_buffer;
 123
 124         if (!pn533_rx_frame_is_ack(in_frame)) {
 125                 nfc_err(&phy->udev->dev, "Received an invalid ack\n");
 126                 cmd->status = -EIO;
 127                 goto sched_wq;
 128         }
 129
 130         rc = pn533_submit_urb_for_response(phy, GFP_ATOMIC);
 131         if (rc) {
 132                 nfc_err(&phy->udev->dev,
 133                         "usb_submit_urb failed with result %d\n", rc);
 134                 cmd->status = rc;
 135                 goto sched_wq;
 136         }
 137
 138         return;
 139
 140 sched_wq:
 141         queue_work(priv->wq, &priv->cmd_complete_work);
 142 }
 143
 144 static int pn533_submit_urb_for_ack(struct pn533_usb_phy *phy, gfp_t flags)
 145 {
 146         phy->in_urb->complete = pn533_recv_ack;
 147
 148         return usb_submit_urb(phy->in_urb, flags);
 149 }
 150
 151 static int pn533_usb_send_ack(struct pn533 *dev, gfp_t flags)
 152 {
 153         struct pn533_usb_phy *phy = dev->phy;
 154         static const u8 ack[6] = {0x00, 0x00, 0xff, 0x00, 0xff, 0x00};
 155         /* spec 7.1.1.3:  Preamble, SoPC (2), ACK Code (2), Postamble */
 156
 157         if (!phy->ack_buffer) {
 158                 phy->ack_buffer = kmemdup(ack, sizeof(ack), flags);
 159                 if (!phy->ack_buffer)
 160                         return -ENOMEM;
 161         }
 162
 163         phy->ack_urb->transfer_buffer = phy->ack_buffer;
 164         phy->ack_urb->transfer_buffer_length = sizeof(ack);
 165         return usb_submit_urb(phy->ack_urb, flags);
 166 }
 167
 168 static int pn533_usb_send_frame(struct pn533 *dev,
 169                                 struct sk_buff *out)
 170 {
 171         struct pn533_usb_phy *phy = dev->phy;
 172         int rc;
 173
 174         if (phy->priv == NULL)
 175                 phy->priv = dev;
 176
 177         phy->out_urb->transfer_buffer = out->data;
 178         phy->out_urb->transfer_buffer_length = out->len;
 179
 180         print_hex_dump_debug("PN533 TX: ", DUMP_PREFIX_NONE, 16, 1,
 181                              out->data, out->len, false);
 182
 183         rc = usb_submit_urb(phy->out_urb, GFP_KERNEL);
 184         if (rc)
 185                 return rc;
 186
 187         if (dev->protocol_type == PN533_PROTO_REQ_RESP) {
 188                 /* request for response for sent packet directly */
 189                 rc = pn533_submit_urb_for_response(phy, GFP_KERNEL);
 190                 if (rc)
 191                         goto error;
 192         } else if (dev->protocol_type == PN533_PROTO_REQ_ACK_RESP) {
 193                 /* request for ACK if that's the case */
 194                 rc = pn533_submit_urb_for_ack(phy, GFP_KERNEL);
 195                 if (rc)
 196                         goto error;
 197         }
 198
 199         return 0;
 200
 201 error:
 202         usb_unlink_urb(phy->out_urb);
 203         return rc;
 204 }
 205
 206 static void pn533_usb_abort_cmd(struct pn533 *dev, gfp_t flags)
 207 {
 208         struct pn533_usb_phy *phy = dev->phy;
 209
 210         /* ACR122U does not support any command which aborts last
 211          * issued command i.e. as ACK for standard PN533. Additionally,
 212          * it behaves stange, sending broken or incorrect responses,
 213          * when we cancel urb before the chip will send response.
 214          */
 215         if (dev->device_type == PN533_DEVICE_ACR122U)
 216                 return;
 217
 218         /* An ack will cancel the last issued command */
 219         pn533_usb_send_ack(dev, flags);
 220
 221         /* cancel the urb request */
 222         usb_kill_urb(phy->in_urb);
 223 }
 224
 225 /* ACR122 specific structs and fucntions */
 226
 227 /* ACS ACR122 pn533 frame definitions */
 228 #define PN533_ACR122_TX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_tx_frame) \
 229                                           + 2)
 230 #define PN533_ACR122_TX_FRAME_TAIL_LEN 0
 231 #define PN533_ACR122_RX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_rx_frame) \
 232                                           + 2)
 233 #define PN533_ACR122_RX_FRAME_TAIL_LEN 2
 234 #define PN533_ACR122_FRAME_MAX_PAYLOAD_LEN PN533_STD_FRAME_MAX_PAYLOAD_LEN
 235
 236 /* CCID messages types */
 237 #define PN533_ACR122_PC_TO_RDR_ICCPOWERON 0x62
 238 #define PN533_ACR122_PC_TO_RDR_ESCAPE 0x6B
 239
 240 #define PN533_ACR122_RDR_TO_PC_ESCAPE 0x83
 241
 242
 243 struct pn533_acr122_ccid_hdr {
 244         u8 type;
 245         u32 datalen;
 246         u8 slot;
 247         u8 seq;
 248
 249         /*
 250          * 3 msg specific bytes or status, error and 1 specific
 251          * byte for reposnse msg
 252          */
 253         u8 params[3];
 254         u8 data[]; /* payload */
 255 } __packed;
 256
 257 struct pn533_acr122_apdu_hdr {
 258         u8 class;
 259         u8 ins;
 260         u8 p1;
 261         u8 p2;
 262 } __packed;
 263
 264 struct pn533_acr122_tx_frame {
 265         struct pn533_acr122_ccid_hdr ccid;
 266         struct pn533_acr122_apdu_hdr apdu;
 267         u8 datalen;
 268         u8 data[]; /* pn533 frame: TFI ... */
 269 } __packed;
 270
 271 struct pn533_acr122_rx_frame {
 272         struct pn533_acr122_ccid_hdr ccid;
 273         u8 data[]; /* pn533 frame : TFI ... */
 274 } __packed;
 275
 276 static void pn533_acr122_tx_frame_init(void *_frame, u8 cmd_code)
 277 {
 278         struct pn533_acr122_tx_frame *frame = _frame;
 279
 280         frame->ccid.type = PN533_ACR122_PC_TO_RDR_ESCAPE;
 281         /* sizeof(apdu_hdr) + sizeof(datalen) */
 282         frame->ccid.datalen = sizeof(frame->apdu) + 1;
 283         frame->ccid.slot = 0;
 284         frame->ccid.seq = 0;
 285         frame->ccid.params[0] = 0;
 286         frame->ccid.params[1] = 0;
 287         frame->ccid.params[2] = 0;
 288
 289         frame->data[0] = PN533_STD_FRAME_DIR_OUT;
 290         frame->data[1] = cmd_code;
 291         frame->datalen = 2;  /* data[0] + data[1] */
 292
 293         frame->apdu.class = 0xFF;
 294         frame->apdu.ins = 0;
 295         frame->apdu.p1 = 0;
 296         frame->apdu.p2 = 0;
 297 }
 298
 299 static void pn533_acr122_tx_frame_finish(void *_frame)
 300 {
 301         struct pn533_acr122_tx_frame *frame = _frame;
 302
 303         frame->ccid.datalen += frame->datalen;
 304 }
 305
 306 static void pn533_acr122_tx_update_payload_len(void *_frame, int len)
 307 {
 308         struct pn533_acr122_tx_frame *frame = _frame;
 309
 310         frame->datalen += len;
 311 }
 312
 313 static bool pn533_acr122_is_rx_frame_valid(void *_frame, struct pn533 *dev)
 314 {
 315         struct pn533_acr122_rx_frame *frame = _frame;
 316
 317         if (frame->ccid.type != 0x83)
 318                 return false;
 319
 320         if (!frame->ccid.datalen)
 321                 return false;
 322
 323         if (frame->data[frame->ccid.datalen - 2] == 0x63)
 324                 return false;
 325
 326         return true;
 327 }
 328
 329 static int pn533_acr122_rx_frame_size(void *frame)
 330 {
 331         struct pn533_acr122_rx_frame *f = frame;
 332
 333         /* f->ccid.datalen already includes tail length */
 334         return sizeof(struct pn533_acr122_rx_frame) + f->ccid.datalen;
 335 }
 336
 337 static u8 pn533_acr122_get_cmd_code(void *frame)
 338 {
 339         struct pn533_acr122_rx_frame *f = frame;
 340
 341         return PN533_FRAME_CMD(f);
 342 }
 343
 344 static struct pn533_frame_ops pn533_acr122_frame_ops = {
 345         .tx_frame_init = pn533_acr122_tx_frame_init,
 346         .tx_frame_finish = pn533_acr122_tx_frame_finish,
 347         .tx_update_payload_len = pn533_acr122_tx_update_payload_len,
 348         .tx_header_len = PN533_ACR122_TX_FRAME_HEADER_LEN,
 349         .tx_tail_len = PN533_ACR122_TX_FRAME_TAIL_LEN,
 350
 351         .rx_is_frame_valid = pn533_acr122_is_rx_frame_valid,
 352         .rx_header_len = PN533_ACR122_RX_FRAME_HEADER_LEN,
 353         .rx_tail_len = PN533_ACR122_RX_FRAME_TAIL_LEN,
 354         .rx_frame_size = pn533_acr122_rx_frame_size,
 355
 356         .max_payload_len = PN533_ACR122_FRAME_MAX_PAYLOAD_LEN,
 357         .get_cmd_code = pn533_acr122_get_cmd_code,
 358 };
 359
 360 struct pn533_acr122_poweron_rdr_arg {
 361         int rc;
 362         struct completion done;
 363 };
 364
 365 static void pn533_acr122_poweron_rdr_resp(struct urb *urb)
 366 {
 367         struct pn533_acr122_poweron_rdr_arg *arg = urb->context;
 368
 369         dev_dbg(&urb->dev->dev, "%s\n", __func__);
 370
 371         print_hex_dump_debug("ACR122 RX: ", DUMP_PREFIX_NONE, 16, 1,
 372                        urb->transfer_buffer, urb->transfer_buffer_length,
 373                        false);
 374
 375         arg->rc = urb->status;
 376         complete(&arg->done);
 377 }
 378
 379 static int pn533_acr122_poweron_rdr(struct pn533_usb_phy *phy)
 380 {
 381         /* Power on th reader (CCID cmd) */
 382         u8 cmd[10] = {PN533_ACR122_PC_TO_RDR_ICCPOWERON,
 383                       0, 0, 0, 0, 0, 0, 3, 0, 0};
 384         char *buffer;
 385         int transferred;
 386         int rc;
 387         void *cntx;
 388         struct pn533_acr122_poweron_rdr_arg arg;
 389
 390         dev_dbg(&phy->udev->dev, "%s\n", __func__);
 391
 392         buffer = kmemdup(cmd, sizeof(cmd), GFP_KERNEL);
 393         if (!buffer)
 394                 return -ENOMEM;
 395
 396         init_completion(&arg.done);
 397         cntx = phy->in_urb->context;  /* backup context */
 398
 399         phy->in_urb->complete = pn533_acr122_poweron_rdr_resp;
 400         phy->in_urb->context = &arg;
 401
 402         print_hex_dump_debug("ACR122 TX: ", DUMP_PREFIX_NONE, 16, 1,
 403                        cmd, sizeof(cmd), false);
 404
 405         rc = usb_bulk_msg(phy->udev, phy->out_urb->pipe, buffer, sizeof(cmd),
 406                           &transferred, 0);
 407         kfree(buffer);
 408         if (rc || (transferred != sizeof(cmd))) {
 409                 nfc_err(&phy->udev->dev,
 410                         "Reader power on cmd error %d\n", rc);
 411                 return rc;
 412         }
 413
 414         rc =  usb_submit_urb(phy->in_urb, GFP_KERNEL);
 415         if (rc) {
 416                 nfc_err(&phy->udev->dev,
 417                         "Can't submit reader poweron cmd response %d\n", rc);
 418                 return rc;
 419         }
 420
 421         wait_for_completion(&arg.done);
 422         phy->in_urb->context = cntx; /* restore context */
 423
 424         return arg.rc;
 425 }
 426
 427 static void pn533_send_complete(struct urb *urb)
 428 {
 429         struct pn533_usb_phy *phy = urb->context;
 430
 431         switch (urb->status) {
 432         case 0:
 433                 break; /* success */
 434         case -ECONNRESET:
 435         case -ENOENT:
 436                 dev_dbg(&phy->udev->dev,
 437                         "The urb has been stopped (status %d)\n",
 438                         urb->status);
 439                 break;
 440         case -ESHUTDOWN:
 441         default:
 442                 nfc_err(&phy->udev->dev,
 443                         "Urb failure (status %d)\n",
 444                         urb->status);
 445         }
 446 }
 447
 448 static struct pn533_phy_ops usb_phy_ops = {
 449         .send_frame = pn533_usb_send_frame,
 450         .send_ack = pn533_usb_send_ack,
 451         .abort_cmd = pn533_usb_abort_cmd,
 452 };
 453
 454 static int pn533_usb_probe(struct usb_interface *interface,
 455                         const struct usb_device_id *id)
 456 {
 457         struct pn533 *priv;
 458         struct pn533_usb_phy *phy;
 459         struct usb_host_interface *iface_desc;
 460         struct usb_endpoint_descriptor *endpoint;
 461         int in_endpoint = 0;
 462         int out_endpoint = 0;
 463         int rc = -ENOMEM;
 464         int i;
 465         u32 protocols;
 466         enum pn533_protocol_type protocol_type = PN533_PROTO_REQ_ACK_RESP;
 467         struct pn533_frame_ops *fops = NULL;
 468         unsigned char *in_buf;
 469         int in_buf_len = PN533_EXT_FRAME_HEADER_LEN +
 470                          PN533_STD_FRAME_MAX_PAYLOAD_LEN +
 471                          PN533_STD_FRAME_TAIL_LEN;
 472
 473         phy = devm_kzalloc(&interface->dev, sizeof(*phy), GFP_KERNEL);
 474         if (!phy)
 475                 return -ENOMEM;
 476
 477         in_buf = kzalloc(in_buf_len, GFP_KERNEL);
 478         if (!in_buf)
 479                 return -ENOMEM;
 480
 481         phy->udev = usb_get_dev(interface_to_usbdev(interface));
 482         phy->interface = interface;
 483
 484         iface_desc = interface->cur_altsetting;
 485         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 486                 endpoint = &iface_desc->endpoint[i].desc;
 487
 488                 if (!in_endpoint && usb_endpoint_is_bulk_in(endpoint))
 489                         in_endpoint = endpoint->bEndpointAddress;
 490
 491                 if (!out_endpoint && usb_endpoint_is_bulk_out(endpoint))
 492                         out_endpoint = endpoint->bEndpointAddress;
 493         }
 494
 495         if (!in_endpoint || !out_endpoint) {
 496                 nfc_err(&interface->dev,
 497                         "Could not find bulk-in or bulk-out endpoint\n");
 498                 rc = -ENODEV;
 499                 goto error;
 500         }
 501
 502         phy->in_urb = usb_alloc_urb(0, GFP_KERNEL);
 503         phy->out_urb = usb_alloc_urb(0, GFP_KERNEL);
 504         phy->ack_urb = usb_alloc_urb(0, GFP_KERNEL);
 505
 506         if (!phy->in_urb || !phy->out_urb || !phy->ack_urb)
 507                 goto error;
 508
 509         usb_fill_bulk_urb(phy->in_urb, phy->udev,
 510                           usb_rcvbulkpipe(phy->udev, in_endpoint),
 511                           in_buf, in_buf_len, NULL, phy);
 512
 513         usb_fill_bulk_urb(phy->out_urb, phy->udev,
 514                           usb_sndbulkpipe(phy->udev, out_endpoint),
 515                           NULL, 0, pn533_send_complete, phy);
 516         usb_fill_bulk_urb(phy->ack_urb, phy->udev,
 517                           usb_sndbulkpipe(phy->udev, out_endpoint),
 518                           NULL, 0, pn533_send_complete, phy);
 519
 520         switch (id->driver_info) {
 521         case PN533_DEVICE_STD:
 522                 protocols = PN533_ALL_PROTOCOLS;
 523                 break;
 524
 525         case PN533_DEVICE_PASORI:
 526                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
 527                 break;
 528
 529         case PN533_DEVICE_ACR122U:
 530                 protocols = PN533_NO_TYPE_B_PROTOCOLS;
 531                 fops = &pn533_acr122_frame_ops;
 532                 protocol_type = PN533_PROTO_REQ_RESP,
 533
 534                 rc = pn533_acr122_poweron_rdr(phy);
 535                 if (rc < 0) {
 536                         nfc_err(&interface->dev,
 537                                 "Couldn't poweron the reader (error %d)\n", rc);
 538                         goto error;
 539                 }
 540                 break;
 541
 542         default:
 543                 nfc_err(&interface->dev, "Unknown device type %lu\n",
 544                         id->driver_info);
 545                 rc = -EINVAL;
 546                 goto error;
 547         }
 548
 549         priv = pn533_register_device(id->driver_info, protocols, protocol_type,
 550                                         phy, &usb_phy_ops, fops,
 551                                         &phy->udev->dev, &interface->dev);
 552
 553         if (IS_ERR(priv)) {
 554                 rc = PTR_ERR(priv);
 555                 goto error;
 556         }
 557
 558         phy->priv = priv;
 559
 560         rc = pn533_finalize_setup(priv);
 561         if (rc)
 562                 goto error;
 563
 564         usb_set_intfdata(interface, phy);
 565
 566         return 0;
 567
 568 error:
 569         usb_free_urb(phy->in_urb);
 570         usb_free_urb(phy->out_urb);
 571         usb_free_urb(phy->ack_urb);
 572         usb_put_dev(phy->udev);
 573         kfree(in_buf);
 574
 575         return rc;
 576 }
 577
 578 static void pn533_usb_disconnect(struct usb_interface *interface)
 579 {
 580         struct pn533_usb_phy *phy = usb_get_intfdata(interface);
 581
 582         if (!phy)
 583                 return;
 584
 585         pn533_unregister_device(phy->priv);
 586
 587         usb_set_intfdata(interface, NULL);
 588
 589         usb_kill_urb(phy->in_urb);
 590         usb_kill_urb(phy->out_urb);
 591         usb_kill_urb(phy->ack_urb);
 592
 593         kfree(phy->in_urb->transfer_buffer);
 594         usb_free_urb(phy->in_urb);
 595         usb_free_urb(phy->out_urb);
 596         usb_free_urb(phy->ack_urb);
 597         kfree(phy->ack_buffer);
 598
 599         nfc_info(&interface->dev, "NXP PN533 NFC device disconnected\n");
 600 }
 601
 602 static struct usb_driver pn533_usb_driver = {
 603         .name =         "pn533_usb",
 604         .probe =        pn533_usb_probe,
 605         .disconnect =   pn533_usb_disconnect,
 606         .id_table =     pn533_usb_table,
 607 };
 608
 609 module_usb_driver(pn533_usb_driver);
 610
 611 MODULE_AUTHOR("Lauro Ramos Venancio <lauro.venancio@openbossa.org>");
 612 MODULE_AUTHOR("Aloisio Almeida Jr <aloisio.almeida@openbossa.org>");
 613 MODULE_AUTHOR("Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>");
 614 MODULE_DESCRIPTION("PN533 USB driver ver " VERSION);
 615 MODULE_VERSION(VERSION);
 616 MODULE_LICENSE("GPL");